Inputs
Units:
Material Assistant
Recommended density: — kg/m³
m
m
m
%
m
m
%
m
m
m
%
m³
%
kg/m³
%
kg/m³
Placed dry density: — kg/m³
kg
Results
| Metric | Value | Notes |
|---|
Tip: Bag count is rounded up to whole bags for ordering.
Example Data
| Scenario | Mode | Dimensions / Volume | Depth | Waste % | Density |
|---|---|---|---|---|---|
| Paver bedding | Area (Rectangle) | 6 m × 4 m | 0.04 m | 5% | Dry — 1600 kg/m³ |
| Play area | Area (Circle) | Ø 5 m | 0.15 m | 7% | Damp — 1680 kg/m³ |
| Trench bedding | Trench | 30 m × 0.45 m | 0.2 m | 10% | Wet — 1920 kg/m³ |
| Imported fill | Direct Volume | 12 m³ | — | 5% | Dry — 1600 kg/m³ |
Formulas Used
Volume (rectangle) = Length × Width × Depth
Volume (circle) = π × (Diameter/2)2 × Depth
Volume (trench) = Trench Length × Trench Width × Trench Depth
Adjusted Volume = Raw Volume × (1 + Waste%/100)
Mass = Adjusted Volume × Density
Bag Count = Mass ÷ Bag Size (rounded up)
How to Use
- Choose the mode that matches your project geometry.
- Enter dimensions or total volume, plus your desired depth.
- Set waste to cover unevenness, settlement, and trimming.
- Use Material Assistant to align grading, moisture, and density.
- Optionally enter Proctor data to weight mass by placed density.
- Pick a supplier preset or custom bag size for procurement.
- Click Calculate, then export CSV or PDF for your records.
FAQs
Results are engineering estimates. Site conditions, compaction, and moisture can change volumes and density. Always validate on-site and add contingency where appropriate.
Use Material Assistant for a recommended value based on sieve grading and moisture. Or enter supplier tested density directly using Custom to match your specific material.
If you enable Proctor, mass is computed using placed dry density = relative compaction × lab maximum dry density. This helps align order quantities with compacted field conditions.
Very fine suits play or jointing sands, fine to medium for bedding, and coarse for drainage layers. Confirm with supplier specs or ASTM/BS standards for your application.
Yes. Switch units to US/Imperial. Lengths show in feet, volume in cubic yards or cubic feet, and mass converted to pounds and short tons.
Commonly 5–10% for bedding or leveling layers. Trench bedding or irregular areas may warrant 10–15%. Consider site variability, trimming, and settlement.
Choose a preset to quickly apply common bag sizes. You can still overwrite the value, and bulk options set one-ton or 2000 lb super sack sizing automatically.